Guard for a walk behind power trowel



FIG. 1 is a perspective view of a guard for a walk behind power trowel showing my new design. Any broken lines within this Figure showing the environment are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a first side view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a second side view thereof. 

CLAIM The ornamental design for a guard for a walk behind power trowel, as shown and described. 